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题目内容双击单词支持查询和收藏哦～
Ellen Swallow Richards, a (i)_____ environmental preservation in the United States, campaigned during the nineteenth century to (ii)_____ responsible practices in the discipline that has come to be known as ecology.
- Blank(i)
- foil for
- pioneer of
- mitigator of
- Blank(ii)
- expose
- implement
- squelch
pioneer of , implement 显示答案
以上解析由 考满分老师提供。
